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| Item Type: | Article |
|---|---|
| Title: | Agonistic β2-adrenergic receptor autoantibodies characterize the aqueous humor of patients with primary and secondary open-angle glaucoma |
| Creators Name: | Hohberger, B. and Wörn, M. and Lämmer, R. and Mahajan, A. and Mardin, C. and Schötzer-Schrehardt, U. and Kunze, R. and Herrmann, M. and Wallukat, G. |
| Abstract: | PURPOSE: Agonistic β2-adrenergic receptor autoantibodies (β2-agAAbs) were recently observed in sera of patients with ocular hypertension (OHT), primary (POAG), and secondary open-angle glaucoma (SOAG), yet not in healthy controls (HCs). It was the aim of the present study to investigate the presence of β2-agAAb in aqueous humor (AH) samples of OAG patients and to correlate these with the corresponding β2-agAAb serum data. MATERIAL AND METHODS: Thirty-nine patients (21 male, 18 female) were recruited from the Department of Ophthalmology, University of Erlangen-Nürnberg: twenty-one POAG, 18 SOAG. Aqueous humor samples were collected during minimal invasive glaucoma surgery. Serum and AH samples were analyzed for β2-agAAb by a bioassay quantifying the beating rate of cultured cardiomyocyte (cut-off: 2 U). RESULTS: Thirty-six of 39 (92.3%) and 34 of 39 (87.2%) of OAG patients showed a β2-agAAb in their sera and AH samples, respectively. All β2-agAAb AH-positive OAG patients were also seropositive. We also observed a β2-agAAb seropositivity in 95 and 89% of patients with POAG and SOAG, respectively. Beta2-agAAbs were seen in 86% (POAG) and 78% (SOAG) of AH samples. The β2-agAAb adrenergic activity was increased in the AH of patients with POAG (6.5 ± 1.5 U) when compared with those with SOAG (4.1 ± 1.1 U; p = 0.004). Serum β2-agAAb adrenergic activity did not differ between the cohorts [POAG (4.5 ± 1.5 U); SOAG (4.6 ± 2.1 U; p=0.458)]. No correlation of the beating rates were observed between serum and AH samples for group and subgroup analyses. CONCLUSION: The detection of β2-agAAb in systemic and local circulations supports the hypothesis of a direct functional impact of these agAAbs on ocular G-protein coupled receptors. The high prevalence of β2-agAAb in serum and AH samples of patients with POAG or SOAG suggests a common role of these AAbs in the etiopathogenesis of glaucoma, independent of open-angle glaucoma subtype. |
| Keywords: | Autoantibodies, Autoimmunity, Glaucoma, Aqueous Humor, β2-Adrenergic Receptor, Animals, Rats |
| Source: | Frontiers in Immunology |
| ISSN: | 1664-3224 |
| Publisher: | Frontiers Media SA |
| Volume: | 12 |
| Page Range: | 550236 |
| Date: | 5 May 2021 |
| Official Publication: | https://doi.org/10.3389/fimmu.2021.550236 |
| PubMed: | View item in PubMed |
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